Placenta previa - Risk factors

Risk factors for placenta previa -
 
1. Previous placenta praevia
2. Previous caesarean sections
3. Previous termination of pregnancy
4. Multiparity
5. Advanced maternal age (>40 years)
6. Multiple pregnancy
7. Smoking
8. Deficient endometrium due to presence or history of -
      - uterine scar
      - Endometritis
      - Manual removal of placenta
      - submucous fibroid
      - assisted conception
      - curettage

(Multiparity, advanced maternal age & assisted conception are high risk factors for placenta previa & abruption both.
Mutiple pregnancy is a risk factor for placenta previa but not abruption.
Non-vertex presentation is a risk factor for abruption but not placenta previa)